Actually, if you look at the lua (prototypes/entity/resources.lua) you see this:
infinite = true

Oh wow, i didn't notice that until now and i've been playing for over 3 hours already!

I'm experiencing the same thing when in peaceful mode.
It looks like if you destroy all spawners in a base the remaining biters will flee towards a nearby biters base, but if there are none nearby they just disappear.

I would like to use the mouse wheel to scroll through the quick-bar items, this of course would require the zooming to be bound to something else. Maybe shift + mouse wheel.

I usually use a few rows of inserters and storage chests to split the networks like this:
The bottom roboports reach to the requester chests just below the furnaces, and the top roboports reach to the storage chests above the furnaces.
But yeah, i wish there was a way to link roboports manually ...

Should this be possible?

During my 74-hour game i've written down some ideas that came to mind while playing.

Trains

More wagon types, fast, slow, big, small.
Flatbed wagons that can carry chests, for logistic purposes.
More locomotive types, steam, electric, dual-headers.
More rail types, electric , monorail ...